利用非标准时域有限差分法对人造等离子体柱体进行散射

Jovia Jose, Sikha K. Simon, Anju Sebastian, Sreedevi P. Chakyar, Joe Kizhakooden, Nees Paul, C. Bindu, K. Umadevi, J. Andrews, V. Joseph
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引用次数: 0

摘要

本文采用非标准时域有限差分(NS-FDTD)方法对人造等离子体柱体对电磁波的散射效应进行了分析。这种NS-FDTD需要较少的迭代时间来收敛,已被证明比标准FDTD精确约10,000倍。对于选定的问题,NS-FDTD中波长与网格空间之比只需为8,而对于标准算法,波长与网格空间之比必须为1140才能得到相同的定性结果。本文将已经成功实现的无损低损耗介质的NS-FDTD算法扩展到高损耗介质。采用细导线的周期性排列设计了一种圆柱形人工负介电常数超材料介质,并利用NS-FDTD研究了等离子体结构的散射特性。为简便起见,相互作用的场量用传播方程来表示。通过选择合适的电导率值,仔细选择稳定函数的收敛点。采用频率小于等离子体频率的平面波进行研究。将所得结果与标准时域有限差分法进行了比较,证明了该算法具有明显的优越性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Scattering from artificial plasma cylinder using nonstandard FDTD
This paper implements Nonstandard Finite Difference Time Domain (NS-FDTD) method to analyses the scattering effect of electromagnetic wave by an artificial plasma cylinder. This NS-FDTD which requires less iteration time for convergence has proved to be around 10,000 times more accurate than the standard FDTD. For a chosen problem, the ratio between wave length and grid space in NS-FDTD need to be only 8 whereas for the standard algorithm it has to be 1140 for the same qualitative result. In this paper, NS-FDTD algorithm which is already successfully implemented for lossless and low loss medium is extended to high loss medium. An artificial negative permittivity metamaterial medium of cylindrical profile is designed using periodic arrangement of thin conducting wires and NS-FDTD is used to study the scattering properties of the plasma structure. For simplicity, interacting field quantities are realized in terms of propagation equation. Converging points of stability function are carefully selected by choosing appropriate value of conductivity. Plane wave of frequency less than the plasma frequency of the artificial plasma cylinder is used for the study. The result obtained is compared with standard FDTD which proves the obvious advantage of using this novel algorithm.
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